JetBlue is bringing back its popular All-You-Can-Jet pass, which allows anyone to travel to an unlimited number of cities over a one-month period.

The “All You Can Jet” pass is being offered for travel between Sept. 7 and Oct. 6.

There are two price tiers: an unlimited pass for $699 or a $499 pass that excludes travel on Fridays and Sundays.

The passes are being issued during a traditionally sluggish travel period wedged between the summer vacation and winter holiday seasons. The only downside? It’s available in limited quantities, and we don’t know how fast they’ll sell out.

To take advantage of this deal, you must be a member of JetBLue’s TrueBlue frequent flyer program. Membership is free.

Some caveats: Flights must be booked 3 days in advance or you’ll pay a $50 booking fee. If you’re a no-show for a flight, you will be charged $100 fee and your pass will be suspended.

There are also restrictions on how often you can pass through the same airport on a single day.

Deadline to purchase the passes is Aug. 20 or until supplies give out, and all travel must be booked between Aug. 23 and Oct. 3.

Despite fees and a higher price, this year’s pass is a better deal than the first time around, said George Hobica, founder of AirfareWatchdog.com.

Because fares are much higher this year, a single flight across the country is $100 more in some cases, he said.

Last year, when the airline first offered the jet pass, the fare was $599 and the passes sold out very quickly.